diff options
| author | Carl Peng <carlpeng008@gmail.com> | 2014-09-30 13:04:55 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2014-10-06 19:50:21 +0200 |
| commit | a445900c906092f3b49ee40a7365d0d54acc568e (patch) | |
| tree | 93e68e3b3826d394d13f82ba89e52343f359a42c /drivers | |
| parent | 925ddb240d6c76e56dd3aa22493f5755c452ba61 (diff) | |
i2c: designware: Add support for AMD I2C controller
Add support for AMD version of the DW I2C host controller. The device is
enumerated from ACPI namespace with ACPI ID AMD0010. Because the core
driver needs an input source clock, and this is not an Intel LPSS device
where clocks are provided through drivers/acpi/acpi_lpss.c, we register the
clock ourselves if the clock rate is given in ->driver_data
Signed-off-by: Carl Peng <carlpeng008@gmail.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/i2c/busses/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-platdrv.c | 27 |
2 files changed, 28 insertions, 0 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index e1d491b0b9c..242f491cf58 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -434,6 +434,7 @@ config I2C_DESIGNWARE_CORE config I2C_DESIGNWARE_PLATFORM tristate "Synopsys DesignWare Platform" select I2C_DESIGNWARE_CORE + depends on (ACPI && COMMON_CLK) || !ACPI help If you say yes to this option, support will be included for the Synopsys DesignWare I2C adapter. Only master mode is supported. diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index e59c63ae4d4..a7431150acf 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -30,6 +30,7 @@ #include <linux/delay.h> #include <linux/i2c.h> #include <linux/clk.h> +#include <linux/clk-provider.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/err.h> @@ -80,6 +81,7 @@ static void dw_i2c_acpi_params(struct platform_device *pdev, char method[], static int dw_i2c_acpi_configure(struct platform_device *pdev) { struct dw_i2c_dev *dev = platform_get_drvdata(pdev); + const struct acpi_device_id *id; dev->adapter.nr = -1; dev->tx_fifo_depth = 32; @@ -93,9 +95,29 @@ static int dw_i2c_acpi_configure(struct platform_device *pdev) dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt, &dev->sda_hold_time); + /* + * Provide a way for Designware I2C host controllers that are not + * based on Intel LPSS to specify their input clock frequency via + * id->driver_data. + */ + id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); + if (id && id->driver_data) + clk_register_fixed_rate(&pdev->dev, dev_name(&pdev->dev), NULL, + CLK_IS_ROOT, id->driver_data); + return 0; } +static void dw_i2c_acpi_unconfigure(struct platform_device *pdev) +{ + struct dw_i2c_dev *dev = platform_get_drvdata(pdev); + const struct acpi_device_id *id; + + id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); + if (id && id->driver_data) + clk_unregister(dev->clk); +} + static const struct acpi_device_id dw_i2c_acpi_match[] = { { "INT33C2", 0 }, { "INT33C3", 0 }, @@ -103,6 +125,7 @@ static const struct acpi_device_id dw_i2c_acpi_match[] = { { "INT3433", 0 }, { "80860F41", 0 }, { "808622C1", 0 }, + { "AMD0010", 133 * 1000 * 1000 }, { } }; MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); @@ -111,6 +134,7 @@ static inline int dw_i2c_acpi_configure(struct platform_device *pdev) { return -ENODEV; } +static inline void dw_i2c_acpi_unconfigure(struct platform_device *pdev) { } #endif static int dw_i2c_probe(struct platform_device *pdev) @@ -258,6 +282,9 @@ static int dw_i2c_remove(struct platform_device *pdev) pm_runtime_put(&pdev->dev); pm_runtime_disable(&pdev->dev); + if (ACPI_COMPANION(&pdev->dev)) + dw_i2c_acpi_unconfigure(pdev); + return 0; } |